Southbound traffic entering Sardine Canyon has been detoured through Mendon to the Valley View Highway, causing major backups.
The detour resulted from a semi-truck fire in the canyon that blocked traffic. The fire erupted around 4 p.m., and as of 6 o'clock the detour was still in effect and causing a large backup on U.S. 89, State Road 23 and the Valley View Highway.
Law enforcement officers were directing traffic at some intersections along the detour route.
The fire started on a semi-trailer hauling hay. Extinguishing the fire has taken several hours as firefighters have worked their way through the burning bales.